Double-acting piston cylinder

The utility model discloses a double-acting piston cylinder, and relates to the technical field of plunger pump driving equipment, according to the double-acting piston cylinder, an oil pipe is arranged on the outer side of a cylinder body, a liquid storage cavity is formed in the middle of the cylinder body, sealing covers are arranged at the two ends of the cylinder body, and sealing rings are arranged on the outer sides of the sealing covers. A telescopic hole is formed in one end of the sealing cover, a base is fixedly installed at one end of the sealing cover, and a spring telescopic rod is movably installed on the inner side of the base. According to the double-acting piston cylinder, the three connectors are arranged to support the scraping ring, the scraping ring is connected with the outer side of the piston rod in a sleeving mode, when the piston rod does telescopic motion under the action of the piston ring, the scraping ring is driven by the piston rod to move, and the scraping ring keeps a certai